Sequence alignment of deduced amino acids of prepro-ap-GnRH and prepro-oct-GnRH. Both prepro-GnRH sequences are numbered in accordance with the prepro-ap-GnRH from the putative N-terminal. The signal peptide, GnRH peptide, and GAP are indicated. The GnRH dodecapeptide is shaded. The cleavage site is in bold. The identical, highly conserved, and less conserved amino acid residues are indicated by *, :, and ., respectively.